On finite-size effects in computer simulations using the Ewald potential

Details On finite-size effects in computer simulations using the Ewald potential On finite-size effects in computer simulations using the Ewald potential

1995-05-04

arxiv.org/abs/chem-ph/9505001v2

Physics

Chemical Physics

Submitted to Journal of Chemical Physics

Scientific paper

10.1063/1.470721

We discuss the origin and relevance for computer simulations of a strong finite-size effect that appears when using the Ewald summation formula. It can be understood as arising from a volume-dependent shift of the potential in a finite, periodic box relative to the infinite volume limit. This shift is due to the fact that the ``zero of energy'' for a periodic system cannot be defined by letting the interacting particles be separated by an infinite distance; the correct definition corresponds to setting its $\bbox k=\bbox 0$ Fourier mode to zero. The implications of this effect for computer simulations are discussed.

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